Add icon for discourse and social media section (#602)

* Add icon for discourse and social media section

* add header name

* update link syntax

Author: lucascolley

config.yaml

@@ -68,8 +68,8 @@ languages:
         socialmedia:
           - link: https://github.com/scipy/scipy
             icon: github
-          - link: https://twitter.com/SciPy_team
-            icon: twitter
+          - link: https://discuss.scientific-python.org/c/contributor/scipy/
+            icon: scientific-python
         quicklinks:
           column1:
             title: ""
@@ -104,3 +104,5 @@ languages:
                 link: /privacy
               - text: Press Kit
                 link: /press-kit
+              - text: Social Media
+                link: /about/#social-media

content/en/about.md

@@ -126,3 +126,10 @@ development infrastructure:
 
 _This list is ordered by time (most recent contributions first) and was
 last updated in January 2022._
+
+<a name="social-media"></a>
+
+## Social Media
+
+- [@scipy on Mastodon](https://mastodon.social/@scipy@fosstodon.org)
+- [@SciPy_team on X](https://x.com/scipy_team)